Display screen with a graphical user interface



FIG. 1 is a front view of a display screen with a graphical user interface.

FIG. 2 is a front view of a second embodiment thereof.

FIG. 3 is a front view of a third embodiment thereof.

FIG. 4 is a front view of a fourth embodiment thereof; and,

FIG. 5 is a front view of a fifth embodiment thereof.

The broken line showing of the display screen and elements within the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 